1 Matched Pair Classic Grade Psvane KT88-T Mark II Vacuum Tubes KT88

1 Matched Pair Classic Grade Psvane KT88-T Mark II Vacuum Tubes KT88

 

KT88-TII is a beam power tetreode, its anode limited dissipation power is 42W. In the audio amplifier, the power can be 100W when it is used as push-pull class AB1 with double tubes, it can also be used in electronic voltage regulator circuit. KT88-TII  is similar with CV5220 and 6550,they can be replaced by each other.

Heater
Uf  ……………6.3 V 
If…………………………1.6 A
Maximum Rating          
Ua……………………800 V 
Ug2………………600 V 
Ug1………………-200 V 
Pa………………42 W 
Pg2…………8 W 
Ua+g2…………46 W 
Ik……………………230 mA 
Uh-k……………200 V 
Tbulb…………………250 C
Rg1 
with cathode bias                                               
Pa+Pg2≤35W 0.47 MΩ 
Pa+Pg2 > 35W 0.27 MΩ 
with fixed bias
Pa+Pg2≤35W 0.22 MΩ 
Pa+Pg2 > 35W 0.10 MΩ

Direct Interelectrode Capacitances 
tetrode connection       triode connection
input………16 9.3 PF 
output ……… 12 17PF 
grid to plate………1.2 7.9 PF

tetrode connection
Ua…………………… 250 V 
Ug2……………………250 V 
Ia ……………………140 mA 
Ig2(approx) ………3 mA 
-Ug1(approx)………15 V 
Gm ……………………12 mA/V 
ri ……………………12 KΩ 
Ug1-g2……………… 8

ri ……………………670 Ω 
u………………………8

triode connection
Ua.g2…………………250 V 
Ia+g2…………………143 mA 
-Ug1(approx)………15 V 
Gm ……………………12 mA/V

Package include:

2pcs Classic Grade Psvane KT88-T Mark II Vacuum Tubes